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Fluorinated graphene material as well as preparation method and application thereof

A technology of fluorinated graphene and fossils, applied in the direction of graphene, chemical instruments and methods, carbon fluoride, etc., can solve the problems of small size, high price, thick slices, etc., and achieve low energy consumption, small pollution, and process The effect of low difficulty

Active Publication Date: 2018-06-19
HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Up to now, the preparation of fluorinated graphene is mainly through two methods, one is ultrasonic exfoliation of fluorinated graphite, the disadvantage is that the obtained fluorinated graphene is usually thicker and smaller in size, and the solvent is difficult to separate, causing pollution also not to be underestimated
The other is to use fluorine gas or XeF 2 The disadvantage of fluorinating graphene is that it is expensive and requires high operating equipment, and both fluorinating agents are highly toxic

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  • Fluorinated graphene material as well as preparation method and application thereof
  • Fluorinated graphene material as well as preparation method and application thereof
  • Fluorinated graphene material as well as preparation method and application thereof

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preparation example Construction

[0031] The embodiment of the present invention provides a kind of preparation method of fluorinated graphene material, comprises the following steps:

[0032] Step 1. Mix the graphene oxide solution with HF acid, and carry out reflux and stirring reaction at 20°C-80°C to obtain a mixed system;

[0033] Wherein, the graphene oxide solution may be a commercial graphene oxide solution or a graphene oxide solution prepared from commercial highly active graphene powder, which is not limited in the present invention; the preferred oxygen content of the graphene oxide is 30wt% -60wt%;

[0034] The concentration of the graphene oxide solution is preferably 0.5mg / mL-5mg / mL, the mass concentration of the HF acid is preferably 20%-40%, and the volume ratio of the graphene oxide solution to the HF acid is preferably 1:0.0125-0.25 ; At this time, the proportion of raw materials used is in line with atomic economy, and the fluorinated graphene product sheet is relatively thin.

[0035] Fo...

Embodiment 1

[0048] Step 1: Add 30mL of graphene oxide (oxygen content 40%) aqueous solution with a concentration of 2mg / mL to 1.5mL of HF acid with a concentration of 30wt%. The reaction was carried out for 24 hours to obtain a mixed system. During the reaction, magnetic stirring was performed, and the rotational speed of the magnet was 300 r / min.

[0049] Step 2: Transfer the mixed system obtained from the reaction to a 50mL reactor, raise the temperature to 120°C at a rate of 3°C / min, and maintain it for 8h. After the reaction is completed, cool naturally to room temperature to obtain a suspension.

[0050] Step 3: Use a Buchner funnel to suction-filter the suspension obtained in step 2. After the suction filtration, add water to the filter residue to wash and suction-filter again until the pH value of the cleaned filtrate is neutral. The filter cake was dispersed with a small amount of water, transferred to a watch glass, and placed in a freeze dryer for freeze-drying for 30 hours. Th...

Embodiment 2

[0053] Step 1: Add 60mL of graphene oxide aqueous solution (oxygen content 60%) with a concentration of 2mg / mL to 3mL of HF acid with a concentration of 40wt%. After reacting for 24 hours, a mixed system was obtained. During the reaction, magnetic stirring was performed, and the rotational speed of the magnet was 500 r / min.

[0054] Step 2: Transfer the mixed system obtained from the reaction to a 100mL reactor, raise the temperature to 120°C at a rate of 3°C / min, and maintain it for 8h. After the reaction is completed, naturally cool to room temperature to obtain a suspension.

[0055] Step 3: Put the suspension obtained in step 2 into a centrifuge for centrifugation, remove the supernatant, continue to add deionized water to wash the precipitate and centrifuge, repeat several times until the pH value of the supernatant is neutral, and the lower precipitate is transferred Put it into a beaker and put it into a vacuum oven at 80°C to dry it for 24h. The obtained sample was a ...

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Abstract

The invention discloses a fluorinated graphene material as well as a preparation method and an application thereof, and belongs to the field of new materials. The preparation method comprises the following steps: mixing a graphene oxide solution with HF acid for reflux stirring reaction at 20-80 DEG C to obtain a mixed system; performing hydrothermal reaction on the mixed system obtained in the step 1 to obtain suspension; removing excess HF from the suspension and performing drying to obtain fluorinated graphene. According to the preparation method, a solvent is pollution-free, a fluorinationreagent is a cheap and easily available HF solution, a small quantity of the reagent is used, and the overall process is low in difficulty, low in pollution and energy consumption; the obtained fluorinated graphene material comprises 2-8 layers of sheets and is thinner; with application of AlH3 or Al powder coated with the fluorinated graphene material prepared with the method in propulsion, sensitivity of AlH3 in propellant application can be reduced, and combustion efficiency of Al powder is improved.

Description

technical field [0001] The invention provides a preparation method and application of a fluorinated graphene material, belonging to the field of new materials. Background technique [0002] Graphene is a carbon atom with sp 2 The hybrid orbitals form a hexagonal two-dimensional material with a honeycomb lattice, only one carbon atom thick. In recent years, due to the unique structure of graphene endowing it with many excellent physical and chemical properties, it has caused a research boom in the fields of physics, chemistry, materials, electronics, biology and mechanics, and has also been used as an excellent reinforcing phase in various composite materials. [0003] The excellent physical and chemical properties of graphene mainly include the following points: (1) Excellent electrical conductivity, its electron transmission speed reaches 1 / 300 of the speed of light, and the carrier mobility can reach 2×10 5 cm 2 / (V s), about 140 times the electron mobility in silicon; ...

Claims

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Application Information

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IPC IPC(8): C01B32/10C01B32/184C01B32/194C06D5/00
CPCC06D5/00
Inventor 何云凤李磊王艳萍黄丹椿汪慧思顾健陶博文
Owner HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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